Security readout for executives and security teams
Plain-English summary
CVE-2023-39809 is a critical command injection flaw in NVK iBSG v3.5. A network attacker may be able to make the appliance run operating-system commands through a hostname setting. That creates potential full compromise of confidentiality, integrity, and availability if the vulnerable management function is reachable.
Executive priority
Treat this as urgent for any confirmed NVK iBSG v3.5 deployment. A vulnerable, reachable management interface could allow full system compromise. Priority is highest when the appliance is internet-facing or accessible from broad internal networks.
Technical view
The CVE describes CWE-77 OS command injection via shell metacharacters in the system_hostname parameter at /manage/network-basic.php. CVSS 3.1 is 9.8 with network attack vector, low complexity, no privileges, and no user interaction. The source bundle names NVK iBSG v3.5, but structured affected vendor/product fields are incomplete.
Likely exposure
Exposure is most likely in environments running NVK iBSG v3.5 where /manage/network-basic.php or the management interface is reachable over a network. The bundle does not provide CPEs, broader version ranges, or deployment prevalence, so asset confirmation is required.
Exploitation context
The source bundle does not show CISA KEV listing or cite active exploitation. The vulnerability characteristics are severe because exploitation is network-accessible, unauthenticated, and can affect confidentiality, integrity, and availability. Public references exist, but exploit status is not established here.
Researcher notes
Evidence is enough to classify the flaw as critical, but affected-product metadata is sparse. The CVE record supplies the vulnerable parameter and endpoint; avoid assuming other versions or products. Confirm vendor status and exposure before declaring remediation complete.
Mitigation direction
- Check NVK or maintainer guidance for patches or supported upgrade paths.
- Remove public internet access to the iBSG management interface.
- Restrict management access to trusted administrative networks or VPNs.
- Prioritize replacement or isolation if no vendor fix is available.
- Monitor for unexpected hostname changes or suspicious management activity.
Validation and detection
- Inventory appliances and confirm whether NVK iBSG v3.5 is present.
- Identify whether /manage/network-basic.php is reachable from untrusted networks.
- Review access controls protecting the management interface.
- Check vendor advisories for fixed versions or configuration guidance.
- Review logs for suspicious changes around network-basic configuration.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-77: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2023-39809 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- ADP timelineCVE
Previously entered references were removed because they are not applicable to this CVE Record.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-07-08T22:21:05.413Z: Previously entered references were removed because they are not applicable to this CVE Record.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/marideCVE reference, mitre
- https://sec.maride.cc/posts/ibsg/CVE reference, mitre
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in a Command ('Command Injection')
Improper Neutralization of Special Elements used in a Command ('Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.